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Association Between VRRP and BFD/NQA/Routing to Monitor the Uplink

Association Between VRRP and BFD/NQA/Routing to Monitor the Uplink

VRRP can only detect faults in VRRP groups. Association between a VRRP group and the interface status allows the device to detect faults on the uplink interface or direct uplink of the master. When an indirect uplink of the master fails, VRRP cannot
detect the fault, causing loss of user traffic. To resolve this issue, you can configure association between VRRP and BFD/NQA/routing. Association between VRRP and BFD/NQA/routing allows the device to
detect faults on the uplink of the master. When the uplink of the master fails, BFD/NQA/routing rapidly detects the fault and instructs the master to adjust its priority. This triggers an active/standby switchover and ensures proper
traffic forwarding.

Figure 3-9 Association between VRRP and BFD/NQA/routing

In Figure 3-9, a VRRP group is configured between SwitchA and SwitchB, which are the master and
backup, respectively. Both switches work in preemption mode. BFD/NQA/routing is configured to detect faults on the link from SwitchA to SwitchE, and association between VRRP and BFD/NQA/routing is configured on SwitchA. When BFD/NQA/routing detects the fault on the link from SwitchA to SwitchE, BFD/NQA/routing instructs the master to adjust its priority. SwitchB becomes the master through negotiation, ensuring
that user traffic is forwarded correctly.